Though the UFC has been messing around with interim titles since 2003, Barao vs. McDonald will be just the second third time that a UFC interim champion will fight another contender while the actual champ remains sidelined. Antonio Rodrigo Nogueira was the last to do so, when he won the interim heavyweight belt against Tim Sylvia in February 2008, then lost it in an interim title defense against Frank Mir later that year. (Update: Andrei Arlovski did it before Nog, when he won the interim heavyweight belt against, yes, Tim Sylvia in February 2005, then defended it successfully against Justin Eilers four months later. Arlovski was declared the UFC’s official heavyweight champion after that fight.)